2191081585 has 16 divisors (see below), whose sum is σ = 3278086272. Its totient is φ = 1365868800.

The previous prime is 2191081561. The next prime is 2191081589. The reversal of 2191081585 is 5851801912.

It is not a de Polignac number, because 2191081585 - 2⁵ = 2191081553 is a prime.

It is a super-2 number, since 2×2191081585² = 9601677024252224450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191081589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2845176 + ... + 2845945.

It is an arithmetic number, because the mean of its divisors is an integer number (204880392).

Almost surely, 2^2191081585 is an apocalyptic number.

It is an amenable number.

2191081585 is a deficient number, since it is larger than the sum of its proper divisors (1087004687).

2191081585 is a wasteful number, since it uses less digits than its factorization.

2191081585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691144.

The product of its (nonzero) digits is 28800, while the sum is 40.

The square root of 2191081585 is about 46808.9904291900. The cubic root of 2191081585 is about 1298.8316099739.

The spelling of 2191081585 in words is "two billion, one hundred ninety-one million, eighty-one thousand, five hundred eighty-five".